body {
    margin: 0;
  }

  .buttons {
    position: absolute;
    top: 12px;
    right: 3%;
    display: flex;
    align-items: center;
  }

  button{
    background-color: var(--color-background);
    border: none;
    font-size: 15px;
    cursor: pointer;
    opacity: .5;
  }
  @media screen and (min-height: 800px){
    button{
        background-color: var(--color-background);
        border: none;
        font-size: 30px;
        cursor: pointer;
        opacity: .5;
    }
}
  
  .body-wrap {
    background-color: #fff;
    width: 600px;
    min-height: 500px;
    margin: 0 auto;
    font-size: 12px;
  }
  @media screen and (min-height: 800px){
    .body-wrap {
      background-color: #fff;
      width: 600px;
      min-height: 500px;
      font-size: 12px;
      margin-top: 20vh;
    }
  }
  
  .pres-timeline {
    font-family: roboto, helvetica, sans-serif;
    font-size: 12px;
    color: #4A4A4A;
    width: 100%;
    /* margin: 30px 0; */
    margin: auto;
  }
  .pres-timeline > div > div {
    padding: 1em 0;
    box-sizing: border-box;
  }
  .pres-timeline .periods-container, .pres-timeline .cards-container {
    overflow: hidden;
    box-sizing: border-box;
    position: relative;
    min-height: 100px;
    transition: height 0.5s ease-in-out;
    background-color: #FFF;
  }
  .periods-container:before {
    background-image: linear-gradient(left, #FFF, rgba(248, 248, 248, 0));
    left: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .periods-container:after {
    background-image: linear-gradient(right, #FFF, rgba(248, 248, 248, 0));
    right: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .periods-container .btn-back, .periods-container .btn-next {
    display: inline-block;
    width: 15%;
    height: 100%;
    position: absolute;
    cursor: pointer;
    z-index: 10;
    transition: 0.3s ease-in-out;
  }
  .periods-container .btn-back:hover, .periods-container .btn-next:hover {
    background-color: rgba(0, 0, 0, 0.05);
  }
  .periods-container .btn-back.hide, .periods-container .btn-next.hide {
    display: none;
  }
  .periods-container .btn-back {
    left: 0;
  }
  .periods-container .btn-next {
    right: 0;
  }
  .periods-container section {
    width: 70%;
    height: 0;
    position: absolute;
    margin-left: 15%;
    border-bottom: 5px solid #dfe3e6;
    padding: 1.5em;
    box-sizing: border-box;
    transition: transform 0.3s ease-in-out, opacity 0.2s ease, height 0.3s ease;
    bottom: 0;
    opacity: 0;
    background-color: #fff;
  }
  .periods-container section.active {
    height: auto;
    opacity: 1;
    transform: translateX(0);
    z-index: 5;
  }
  .periods-container section.active .title, .periods-container section.active p {
    display: block;
  }
  .periods-container section.prev {
    height: auto;
    opacity: 0.4;
    transform: translateX(-100%);
    z-index: 0;
  }
  .periods-container section.prev .year {
    text-align: right;
  }
  .periods-container section.next {
    height: auto;
    opacity: 0.4;
    transform: translateX(100%);
    z-index: 0;
  }
  .periods-container section .year {
    font-size: 20px;
    font-weight: 400;
  }
  .periods-container section .title {
    color: #4A4A4A;
    font-size: 28px;
    font-weight: 400;
    display: none;
  }
  .periods-container section p {
    display: none;
  }
  
  .timeline-container {
    position: relative;
    width: 100%;
    height: 50px;
    overflow: hidden;
  }
  .timeline-container:before {
    background-image: linear-gradient(left, #FFF, rgba(248, 248, 248, 0));
    left: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .timeline-container:after {
    background-image: linear-gradient(right, #FFF, rgba(248, 248, 248, 0));
    right: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .timeline-container .timeline {
    position: absolute;
    display: block;
    height: 50px;
    transition: left 0.3s ease-in-out;
  }
  .timeline-container .timeline ol {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #dfe3e6;
    list-style: none;
    padding-left: 210px;
    padding-right: 300px;
  }
  .timeline-container .timeline ol li {
    display: inline-block;
    padding: 5px;
    margin-top: -11px;
    margin-left: 80px;
    border-radius: 50%;
    border: 3px solid #7f9298;
    background-color: #FFF;
    position: relative;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  }
  .timeline-container .timeline ol li.active {
    box-shadow: none;
  }
  .timeline-container .timeline ol li.active:before {
    content: "";
    display: block;
    height: 25px;
    width: 1px;
    position: absolute;
    top: -25px;
    transition: opacity 0.3s ease-in-out;
  }
  .timeline-container .timeline ol li.active:after {
    content: "";
    display: block;
    height: 25px;
    width: 1px;
    position: absolute;
    bottom: -25px;
    transition: opacity 0.3s ease-in-out;
  }
  .timeline-container .btn-back, .timeline-container .btn-next {
    display: inline-block;
    position: absolute;
    cursor: pointer;
    margin-top: -2px;
    z-index: 11;
    transition: all 0.3s ease;
  }
  .timeline-container .btn-back.hide, .timeline-container .btn-next.hide {
    display: none;
  }
  .timeline-container .btn-back:hover, .timeline-container .btn-next:hover {
    border-color: #7f9298;
  }
  .timeline-container .btn-back {
    left: 1em;
  }
  .timeline-container .btn-next {
    right: 1em;
  }
  
  .cards-container:before {
    background-image: linear-gradient(left, #FFF, rgba(248, 248, 248, 0));
    left: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .cards-container:after {
    background-image: linear-gradient(right, #FFF, rgba(248, 248, 248, 0));
    right: 0;
    content: "";
    position: absolute;
    z-index: 2;
    top: 0;
    height: 100%;
    width: 100px;
  }
  .cards-container section {
    width: 70%;
    position: absolute;
    margin-left: 15%;
    margin-bottom: 2em;
    border: 1px solid #f5f7f6;
    padding: 1.5em;
    box-sizing: border-box;
    transition: transform 0.3s ease-in-out;
    top: 0;
    opacity: 0;
    border-radius: 8px;
    background-color: #fff;
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.15);
  }
  .cards-container section.active {
    height: auto;
    opacity: 1;
    transform: translateX(0);
    z-index: 5;
  }
  .cards-container section.prev {
    height: auto;
    opacity: 0.4;
    transform: translateX(-105%);
    z-index: 0;
  }
  .cards-container section.next {
    height: auto;
    opacity: 0.4;
    transform: translateX(105%);
    z-index: 0;
  }
  .cards-container section .year {
    text-align: center;
    font-size: 16px;
    margin: 0;
  }
  .cards-container section .title {
    font-weight: 400;
  }
  .cards-container section img {
    width: 100%;
  }